Given that Ron Paul is not the leading Republican candidate, that the nomination is more likely to go to Mitt Romney, then why is there so much frenzy, both for and against, for Ron Paul?

There are two potential reasons. The first is that it actually is possible that Ron Paul will win the Republican Party nomination. He is the true second place candidate in the primary in spite of being eclipsed by various temporary other "flavor of the month" candidates.

Some people are led by their ideology to choose a political party, and because they are idealists are willing to reject the party when the party strays from what it is supposed to stand for. Some people are led by their party to choose an ideology, and if the party changes they change along with it. For some, ideas come first. For others, power and party come first.

Because of all the reasons detailed by those authors who wrote in favor of Ron Paul, he has some very strong appeal to those who place ideas as their primary motivation. And Barack Obama has very weak appeal to those same people. He could easily enough steal the support of those idealists from the Democratic Party where they are more often found, and therefore away from Barack Obama.

Those who place party first recognize this as a very real threat. Since their primary motivation is victory for their party, they are out to nullify Ron Paul before he becomes an actual threat. And that means convincing independents and Democrats that they have no reason to vote in Republican primaries for him.